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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsOther › RJX Head crash question
10-13-2010 08:17 PM  8 years ago
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jbiter

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Sebring, FL

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RJX Head crash question
Hi All,

I have been considering buying some spares for my 600 size RJX FBL heads. For those that have flown this head a while, do you think it is worthwhile to buy a spare head block? The 8mm spindle did not bend on my last upgrade opportunity and it got me wondering if I might bend a head block instead.

What do you think?

Jeff
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10-13-2010 09:20 PM  8 years ago
fastflyer20

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N. Tonawanda, NY

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I have 100's of flights on mine, and 4 crashes, no super direct hits to the head. The screws holding the arms loosened and the mr688 bearings take the knock, no other parts have needed to be replaced (yet). Based on what I have seen, the arms are the weak link, possible "protecting" the feathering shaft. It has a great clamping system to the main shaft, superior to the Align heads that keep the rotor head clamping in good shape. Watch the small screws holding the arms to the rotor head, clean well, use loc-tite and make sure the shorter of the two screws does not extend into the bore, putting pressure on the thrust bearing race.

Stock mr688 bearings, even a light blade strike and at least one or two bearings will be notchy.
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10-13-2010 09:45 PM  8 years ago
jbiter

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Sebring, FL

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Interesting. My upgrade opportunity came while I was flying around the property and switched flight modes causing the heli to rapidly climb into a tree. A 50 size heli turning 2000 RPM will lop off 1" branches with ease. Interesting enough it didn't cause any damage to the head including the bearings but the blades were toast.

I began to wonder about the head block as this is a problem with the 450V2 and newer helis once they increased the spindle size in those.

Jeff
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